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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->控制科学与工程·机械工程]]></title>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Review on two-dimensional trajectory correction projectile and its guidance and control technology]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In view of the wide application prospect of intelligent ammunition, the development of two-dimensional trajectory correction projectile, main correction mechanism scheme and guidance control technology were summarized. The development process of the two-dimensional trajectory correction projectile was reviewed, aiming to reveal the development principle. Several main correction schemes were discussed, and the function characteristics and research difficulties of each mechanism were analyzed. Based on the requirements of the two-dimensional trajectory correction projectile, the research status of its control technology was summarized from three aspects:aerodynamic identification and state estimation algorithm, parameter optimization algorithm and guidance law. The rapid development of intelligent algorithm in recent years, especially the application of neural network theory in the field of control algorithm was focused on. The main technical difficulties and the future development direction of the control research of the two-dimensional trajectory correction projectile, which provides ideas for the design, were pointed out.]]></description>
<pubDate>2021/7/20 0:00:00</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[XING Bingnan, DU Zhonghua, DU Chengxin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XING Bingnan, DU Zhonghua, DU Chengxin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104008]]></guid><cfi:id>20</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[High-temperature reusability of ceramics tile resistant to 1200 ℃]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The structure and performance evolution of 1 200 ℃ ceramic tile repeated at 1 200 ℃ were studied. Results show that after heat treatment at 1 200 ℃ for 20 times, the ceramic tile with 1 200 ℃ exhibits good macroscopic thermal stability. During the repeated heat treatment, sintering occurs between the fibers, and the bonds are melted. Quartz fiber crystallization and grain growth result in fiber diameter changes, such as neckdown, and 14% shrinkage rate of Z direction, which in turn makes the compressive strength slightly increase, and the thermal insulation performance decrease. After 1 260 ℃ and 11 times of single-sided radiant heating, the Z-direction shrinkage rate was 5.58%, and the thermal insulation effect is reduced by 7.59%. However, the thermal insulation material can maintain the thermal insulation performance of the material after 6 repeated heating.]]></description>
<pubDate>2021/7/20 0:00:00</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[CHEN Sian, LI Haiyu, CHI Pengtao, GAO Yang, LI Junning, XIE Weihua]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Sian, LI Haiyu, CHI Pengtao, GAO Yang, LI Junning, XIE Weihua</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104009]]></guid><cfi:id>19</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-population genetic optimization algorithm with elite retention for moving-armature permanent magnet linear direct current motor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to realize the high maneuverability of the electromagnetic catapult and the high power density of the linear catapult motor of the land-based unmanned aerial vehicle, a multi-population genetic algorithm with elite retention (MPGAER) was proposed to optimize the maximum power density of motor. It takes flux density and current density as constraints, and optimizes the structure parameters of the motor with its strong search ability and fast convergence speed, and compares with the initial scheme based on magnetic circuit method and the optimization results of traditional genetic algorithm. The results show that, compared with the initial scheme design, MPGAER can reduce the motor mass by 6.25%, increase the power density by 10%, and improve the dynamic performance of the motor; the motor power density of the MPGAER optimized design is higher than the genetic algorithm design result, which indicates that the proposed method effectively solves the problems of easy convergence to the local best advantage and poor optimization effect in the optimization process.]]></description>
<pubDate>2021/7/20 17:26:14</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[WU Jun, WANG Xiang, SONG Lei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Jun, WANG Xiang, SONG Lei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104010]]></guid><cfi:id>18</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Performance analysis of the moving primary six-phase linear induction motor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to accurately describe the object model, the first-order equivalent circuit transient eddy current analysis method was used to quantitatively calculate the parameter time-varying rule of the moving primary high-speed six-phase linear induction motor under the influence of the dynamic end effect, and the equivalent circuit of the motor was deduced considering the dynamic end effect through the deduce of the induction eddy current loss. On this basis, the performance characteristics of the motor under the influence of the dynamic end effect were analyzed in detail through the calculation of electromagnetic thrust and efficiency evaluation. The correctness of the theoretical analysis and the accuracy of the motor model were verified by the finite element simulation and dynamic experiment under different operating speeds.]]></description>
<pubDate>2021/7/20 17:26:14</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[韩一, 聂子玲, 许金, 朱俊杰]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>韩一, 聂子玲, 许金, 朱俊杰</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104011]]></guid><cfi:id>17</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Rotor position estimation error compensated by virtual current injection method online]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104012]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The rotating high-frequency injection method can estimate the rotor position of the permanent magnet synchronous motor at zero speed and low speed. However, the use of filters in demodulation introduces estimation errors. A virtual current injection method was proposed to compensate the rotor position error on-line. Based on the estimated speed, the method structured a virtual current same frequency as the negative sequence response current. After the same demodulation as the negative sequence current, the method obtained the phase of virtual current. The error between the obtained phase and structured phase was used to compensate the estimated rotor position. Further analysis compared the actual speed fluctuation with that of the estimated speed fluctuation, caused by the rotating voltage and the positive sequence response current respectively. A low-pass filter was advocated to improve the compensation effect. Simulations and experiments verified the effect of the proposed method on rotor position error compensation when the motor was in different states.]]></description>
<pubDate>2021/7/20 17:26:14</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[PENG Wei, QIAO Mingzhong, JIANG Chao, GAO Jianxin, LU Xihao]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>PENG Wei, QIAO Mingzhong, JIANG Chao, GAO Jianxin, LU Xihao</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104012]]></guid><cfi:id>16</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Life prediction method of hull structures considering corrosion factors]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104013]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to establish a life prediction method for hull structures considering corrosion factors, based on the analysis of the existing time-varying corrosion damage models of ship hull structures, a time-varying corrosion model considering the factors of action time and maintenance time of corrosion protection system was established according to the actual situation of ship maintenance support. According to the relevant codes, the lifetime standard of hull structure was selected and a prediction method for calculating the lifetime of hull structures was established. The method established the quantitative relationship between the lifetime of hull structure and the factors such as the action time and repair time of corrosion protection system. This method can be used to predict the life of ship structure under uniform corrosion condition, and in turn can be used to guide the selection of design indexes of corrosion protection system and the determination of maintenance strategy of hull structure.]]></description>
<pubDate>2021/7/20 17:26:14</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[MU Jinlei, HUA Lin, ZHANG Zhongliang, WU Fan, PENG Fei, MIN Shaosong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>MU Jinlei, HUA Lin, ZHANG Zhongliang, WU Fan, PENG Fei, MIN Shaosong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104013]]></guid><cfi:id>15</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Air combat target grouping based on improved CBSCAN algorithm]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104014]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the shortcomings of the traditional clustering algorithm on the clustering effect of manifold data, and the low real-time performance, the improved CBSCAN (cell-based density spatial clustering of applications with noise) was proposed to solve air combat target grouping issue. By analyzing the air combat situation parameters, the general model of air combat target grouping was established and the target grouping was transformed into clustering problem. Then, the target grouping model based on improved CBSCAN was established by improving the clustering method of CBSCAN algorithm. Through simulation experiments, the clustering accuracy and real-time performance of K-means, expectation maximum algorithm, density peak algorithm, density-based spatial clustering of applications with noise algorithm, CBSCAN algorithm and improved CBSCAN algorithm in 30 combat situations were compared and analyzed. The results show that the improved CBSCAN algorithm can correctly group multi-target formations under the condition of unknown number of formations and target manifold distribution, and the real-time performance was improved by about 30% compared with the original algorithm, which shows the practical application value of the proposed method.]]></description>
<pubDate>2021/7/20 17:26:14</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[YAN Mengda, YANG Rennong, WANG Xin, ZUO Jialiang, JI Huiming, SHANG Jinxiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YAN Mengda, YANG Rennong, WANG Xin, ZUO Jialiang, JI Huiming, SHANG Jinxiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202104014]]></guid><cfi:id>14</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Point cloud registration algorithm based on scale difference descriptor of point neighborhood]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103015]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the problem of high computational complexity of feature descriptors and low registration accuracy, a point cloud registration algorithm based on the differences of region′s feature information in different scales was proposed. In the aspect of feature descriptor, the neighborhood spaces with different scales were selected for the key points. The normalized eigenvalue vector differences and normal vector angles between the scales were calculated. The descriptor of key point based on neighborhood scale differences was created. It is simple and time-saving. For the key points searching, a key point extraction method based on shape index was designed. The obtained key points have better representative ability. For searching the corresponding relationship, a double screening method based on Euclidean distance was proposed to find the correspondence set. The global optimal searching algorithm based on global distance was designed to find the transformation matrix between two point clouds. The experimental results show that the registration algorithm has good accuracy and robust noise robustness.]]></description>
<pubDate>2021/6/2 15:34:18</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[LU Jun, CHEN Kun, FAN Zhejun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LU Jun, CHEN Kun, FAN Zhejun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103015]]></guid><cfi:id>13</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of gravity disturbance for SINS horizontal attitude]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to study the relationship between horizontal attitude error angle and horizontal gravity disturbance of SINS (strapdown inertial navigation system) on moving base, the transfer function between horizontal attitude error and horizontal gravity disturbance on SINS mechanization was deduced in uniform linear motion in North-South direction and East-West direction. The distribution of zero and pole of transfer function was analyzed. In addition, the transfer function between horizontal attitude error angle and horizontal gravity disturbance was analyzed in integrated navigation mode. The amplitude-frequency characteristics of transfer function on SINS mechanization and integrated navigation mode were analyzed by simulation. Compared with the SINS mechanization, the cut-off frequency of integrated navigation mode was higher, and the attitude error angle of inertial navigation was affected by high-frequency gravity disturbance signals more obviously. Therefore, the INS needs higher resolution gravity disturbance data to compensate the gravity disturbance in the integrated navigation mode. However, there is a limit for the resolution of gravity disturbance used to compensate for the high-precision inertial navigation system. Too fine gravity disturbance data will only bring cost for measurement and storage instead of improving the attitude accuracy of the inertial navigation system.]]></description>
<pubDate>2021/6/2 15:34:18</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[AN Wen, XU Jiangning, WU Miao, LI Feng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>AN Wen, XU Jiangning, WU Miao, LI Feng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103016]]></guid><cfi:id>12</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Acceleration measurement of atomic interference in optical waveguide]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[An acceleration measurement scheme with atom interference in optical waveguide at horizontal direction was presented. The optical structure, radical preparation and optical waveguide adiabatic loading were described in detail. In order to verify the measurement scheme by using the experiment means, the radical <sup>87</sup>Rb was cooled into Bose-Einstein condensate, then the splitting and combining of the ultracold radical was achieved by the Bragg diffraction and the process of atom interference was completed. The experiment results show that the interferometer can measure the axial acceleration of the optical waveguide, which is of reference value for the future study of multi-axis acceleration measurement.]]></description>
<pubDate>2021/6/2 15:34:18</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[WEI Chunhua, LIANG Lei, ZUO Chenglin, YAN Shuhua, YANG Jun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WEI Chunhua, LIANG Lei, ZUO Chenglin, YAN Shuhua, YANG Jun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103017]]></guid><cfi:id>11</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design of large depth combined co-vibrating vector hydrophone]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to solve the problem that deep-sea unmanned mobile platforms lack combined vector hydrophones which match their working depth, a large depth combined co-vibrating vector hydrophone was designed and developed with the thin aluminum alloy spherical shell as its vector channel and the piezoelectric ceramic ring as its sound pressure channel. The acoustic performance and pressure resistance of the hydrophone was verified by theoretical calculation, finite element simulation and experimental test. The size of the hydrophone is Φ85 mm, with the mass being 398 g, and the average density being 1 240 kg/m<sup>3</sup>. Its working frequency range is from 20 to 3 000 Hz. The vector channel of the hydrophone is cosine directional, and its sensitivity is -187 dB@ 500 Hz. The sound pressure channel has non-direction, with the sensitivity being -191 dB @ 500 Hz. This vector hydrophone has a working depth of 2 000 m. Sea tests show that this hydrophone can be applied on deep-sea unmanned platforms, such as underwater gliders, and can carry out acoustic detection missions,which means that it has great application values in the field of deep-sea acoustic detection.]]></description>
<pubDate>2021/6/2 15:34:18</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[WANG Wenlong, SUN Qindong, WANG Chao, HAN Mei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Wenlong, SUN Qindong, WANG Chao, HAN Mei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103018]]></guid><cfi:id>10</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Rheological property and printability of epoxy resin materials for direct extrusion fabrication]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Using composite materials to replace aluminum alloy, steel or titanium alloy is of far-reaching significance. With the development of new material science, the advantages of direct extrusion fabrication are becoming increasingly prominent. In principle, direct extrusion fabrication is suitable for any paste or gel composite material with or without additives. The purpose of this study is to find out the general rheological parameters of thermosetting epoxy resin in the direct extrusion fabrication application by discussing the rheological properties and extrusion fabrication properties of the composite. The rheological behavior of the composite was designed by adding thickener. A gantry pneumatic extrusion 3D printer was designed and built to test and analyze the printing effect of composite materials. Combined with the experimental results, the influence of nozzle height on printing results was analyzed, and a calculation method suitable for critical value of nozzle height was proposed. The effects of shear rate, extrusion rate and extrusion pressure on the molding quality of materials were also analyzed. Aiming at the problem of multi-layer printing, a method for calculating the critical value of nozzle height of multi-layer printing was proposed. The above conclusions provide guidance methods for the extrusion 3D printing of composite materials.]]></description>
<pubDate>2021/6/2 0:00:00</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[LI Xin, SUN Chongfei, SHANG Jianzhong, LUO Zirong, LU Zhongyue, NIU Xiaoru]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Xin, SUN Chongfei, SHANG Jianzhong, LUO Zirong, LU Zhongyue, NIU Xiaoru</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103019]]></guid><cfi:id>9</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Capture zones and differential game guidance law for high-speed maneuvering target interception]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the high-speed maneuvering target interception scenario, the conditions for the existence of the capture zone in the terminal guidance phase and the differential game guidance law were studied. The relative motion model of missile and target was established and the control dynamics model was introduced, and the relative motion model was reduced by terminal projection method. Based on the differential game theory, an analytic capture zone was derived, which can be used in the interception of maneuvering targets by a missile with dual control. The existence of the capture zone can ensure the accurate capture of any maneuvering target. The performance index function was re-selected, and the guidance problem of the target and the dual control missile with the collision angle constraint at the end was transformed into the zero-sum differential game problem, and the optimal interception strategy was solved. The simulation analyzed the existence of the capture zone of the dual control missile intercepting the target in several cases. Simulation results of the guidance law show that the differential game guidance law has better performance when intercepting high-speed maneuvering targets.]]></description>
<pubDate>2021/6/2 15:34:18</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[MAO Boyuan, LI Junlong, ZHANG Rui, ZHANG Pengfei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>MAO Boyuan, LI Junlong, ZHANG Rui, ZHANG Pengfei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103020]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Rule and intelligence coupling constraint training method for UAV swarm confrontation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the concept of the intelligent combat of UAV (unmanned aerial vehicle) swarms, the UAV swarms intelligent combat simulation environment was established. Aiming at the problem that it is difficult to accurately control the speed and attack angle of UAVs in the confrontation process through reward signals in traditional reinforcement learning algorithms, the RIC-MADDPG (rule and intelligence coupling constrained multi-agent deep deterministic policy gradient) algorithm was proposed. The algorithm uses rules to constrain the actions of UAVs in reinforcement learning. The simulation results show that the wining-rate of red UAV swarm, trained by the method based on the RIC-MADDPG, can be improved from 53% to 79%. This proves that the strategy of "agent training—problem finding—rule making—agent training again—problem finding again—rule making again" is effective for the optimization of agent combat strategy. The research results can be a reference for establishing the training system of the intelligent combat strategy of UAV swarms and conducting the research of swarm tactics coupling rule and intelligence.]]></description>
<pubDate>2023/1/16 9:46:31</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[GAO Xianzhong, XIANG Lei, WANG Baolai, JIA Gaowei, HOU Zhongxi]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GAO Xianzhong, XIANG Lei, WANG Baolai, JIA Gaowei, HOU Zhongxi</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301018]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Deterministic figuring method by abrasive belt for high-precision shaft parts]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to improve the machining accuracy of the metal shaft parts, the vibrating abrasive belt polishing method was innovatively applied to the deterministic figuring of high-precision shaft parts based on the principle of optical deterministic figuring. In this method, the abrasive belt covered the outer surface of the contact wheel, and the elastic contact wheel contacted the shaft workpiece under a certain pressure to form a rectangular grinding area. The removal of materials could be achieved by the axial vibration of the contact wheel. The contour of the shaft′s surface can be measured by cylindricity meter, and the error′s distribution could be obtained. The dwell time of the contact wheel at different positions on cylindrical surface was calculated by pulse iteration method. The material removal quantity at different positions of workpiece was different by servo control of the machine tool′s spindle, thus the cylindricity error could be corrected deterministically. After the simulated machining, the deterministic figuring experiment was carried out on the cylindrical surface of a 45# steel shaft. Experimental results show that the average roundness error of the workpiece converges from 0.42 μm to 0.11 μm, and the cylindricity error of the workpiece improves from 0.76 μm to 0.35 μm. The shape accuracy after machining is better than that of the ultra-precision cylindrical grinder, which verifies the feasibility of high-precision deterministic figuring on the cylindrical surface of shaft parts.]]></description>
<pubDate>2023/1/16 9:46:31</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[HU Hao, CHEN Xuelei, SUN Zizhou, DAI Yifan, GUAN Chaoliang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HU Hao, CHEN Xuelei, SUN Zizhou, DAI Yifan, GUAN Chaoliang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301019]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Hartley block algorithm and experiment in adaptive control]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the problem that the wavelet packet adaptive control subband contains a large number of convolution and correlation operations, which leads to the slow convergence speed of the algorithm, the WPHB-FxLMS (wavelet packet based on Hartley block filtered-x least mean square ) algorithm was proposed. Fast Hartley transform was introduced into block algorithm to realize fast convolution and correlation operation in frequency domain. Hartley block algorithm was used to generate control signals in the subband, and WPHB-FxLMS algorithm was proposed through the overlapping reservation method. The vibration isolation performance and control effect under fixed frequency and fluctuant frequency working conditions were studied by simulation and experiment. The results show that the WPHB-FxLMS algorithm can not only greatly reduce the convergence time, but also significantly improve the control precision, which has good robustness and stability, and can be applied in engineering practice well.]]></description>
<pubDate>2023/1/16 9:46:31</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[CHAI Kai, LIU Shuyong, GAO Weipeng, ZHU Shijian]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHAI Kai, LIU Shuyong, GAO Weipeng, ZHU Shijian</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301020]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of electromagnetic force and power loss characteristics on high-speed solenoid valve of electric-controlled booster pump]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to further study the electromagnetic force and energy consumption characteristics of the solenoid valve of the electronic-controlled booster pump, a 3D static magnetic field simulation model of the high-speed solenoid valve of the electronic-controlled booster pump was established by using the finite element method, and the accuracy of the model was verified by the experimental data. Through numerical simulation analysis, the characteristics of the electromagnetic force and power loss of the solenoid valve of the electric-controlled booster pump were studied by driving current and structural parameters (the number of coil turns, magnetic pole′s radius, working air gap), and the weight influence of each parameter on the electromagnetic force and power loss of the solenoid valve was obtained and the quantitative analysis was made. The results show that the influence of the radius of major and vice magnetic poles on electromagnetic force accounts for 38.15%, followed by the driving current which accounts for 31.08%, the number of coil turns which accounts for 17.06%, and the working air gap which accounts for 13.71%. From the perspective of power loss, the ratio of driving current, coil turns, radius of major and vice poles and working air gap of electric-controlled booster pump solenoid valve were analyzed. The ratio of coil turns(54.85%) is the highest, followed by the driving current(44.99%), and the minimum ratio of the radius of major and vice magnetic poles and working air gap is only 0.16%.]]></description>
<pubDate>2023/1/16 9:46:31</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[WU Xin, YANG Kun, ZHAO Jianhua, NIE Tao, ZHOU Lei, ZENG Fanming]]></author>
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<atom:name>WU Xin, YANG Kun, ZHAO Jianhua, NIE Tao, ZHOU Lei, ZENG Fanming</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301021]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Prediction and parameter analysis of unsteady broadband thrust for pump jet]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301022]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To predict the unsteady thrust of the interaction between pump jet rotor and turbulence, on the basis of the Sears function, and considering the influence of the turbulence, the prediction formula of propeller broadband unsteady excitation thrust was derived, which was verified by comparison with experimental values. Furthermore, considering the situation that the rotor of the pump-jet propeller works in the wake field of the leading vane, the turbulence wavenumber spectrum of the blade wake was established through the Gauss wake model, and the parameters of the blade wake field were calculated by empirical formulas. The prediction formula of the unsteady broadband force of the pump jet propeller rotor was derived. The broadband unsteady excitation thrust calculated by the formula was similar to the numerical calculation result. The influence of changes in flow field parameters on the prediction results of the propeller rotor broadband radiation noise was analyzed. Research shows that the turbulence intensity only affects the amplitude of the broadband unsteady excitation thrust prediction results, and the turbulence integral scale has a greater impact on the amplitude and spectrum shape.]]></description>
<pubDate>2023/1/16 9:46:31</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[WU Xingyu, WANG Dong, WEI Yingsan, JIN Shuanbao, ZHU Hao, HU Pengfei, SUN Fangxu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Xingyu, WANG Dong, WEI Yingsan, JIN Shuanbao, ZHU Hao, HU Pengfei, SUN Fangxu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301022]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Reliability evaluation of coil spring for fuse with multiple performance parameters]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As a common energy storage component in fuse, spring is an important part which affects the reliability of fuse. The failure of fuse will cause serious hidden danger. In order to accurately predict the change of reliability of the spring for fuse during storage, a multivariate normal reliability evaluation method based on modified Arrhenius model was proposed. Taking the stress loss rate and permanent deformation rate as performance parameters, the constant stress accelerated test was designed to obtain the degradation data of spring at 120 ℃, 130 ℃, 150 ℃ and 160 ℃. Anderson darling statistics were used to verify that the optimal distribution of degradation was normal distribution. According to the modified Arrhenius model, the degradation trajectory curve of spring at storage temperature was obtained. Based on multivariate normal distribution, the storage reliability model of spring was established, and the change characteristics of spring reliability during storage were analyzed. Compared with other reliability models, the prediction results of this model are more accurate, which provides a theoretical basis for the condition-based maintenance of fuse.]]></description>
<pubDate>2023/1/16 0:00:00</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[YANG Chengqiang, GU Xiaohui, PAN Shouhua]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YANG Chengqiang, GU Xiaohui, PAN Shouhua</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301023]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optimal design of self-adaptive climbing mechanism for landing in the amphibious bionic robot]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The amphibious bionic robot is an unmanned system which can work both underwater and on land, which has been widely used in the fields of disaster rescue, environmental detection and resource exploration. An amphibious robot compounded with wheel and fin with the ability of self-adaptive climbing was proposed in this paper. The kinematic and dynamic mechanics of the self-adaptive climbing process was analyzed. The torque required of the critical obstacle crossing point was set as the objective function, and the optimized design structural and operational parameters were obtained by applying the genetic algorithm. Meanwhile, the climbing ability of the amphibious robot in this work was compared with others. The results illustrate that the required torque of the amphibious robot was reduced by 718.4 N·mm. The robot compounded with wheel and fin can climb the vertical obstacle of a larger height. The self-adaptive climbing process of the optimized robot was simulated. The simulation results illustrate that the variation of the propulsive velocity, the displacement and the torque in the processes of moving forward and climbing the obstacles. The experiments of the obstacle climbing was investigated for verifying the structural and operational parameters design.]]></description>
<pubDate>2023/1/16 0:00:00</pubDate>
<category><![CDATA[控制科学与工程·机械工程]]></category>
<author><![CDATA[YIN Qian, WANG He, SONG Zhen, SHANG Jianzhong, LUO Zirong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YIN Qian, WANG He, SONG Zhen, SHANG Jianzhong, LUO Zirong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202301024]]></guid><cfi:id>1</cfi:id><cfi:read>true</cfi:read></item>
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